Drum swager



W. F. SPAHR DRUM SWAGER June 26, 145.

Filed Jan. 2, 1943 2 Sheets-Sheet l W. F. SPAHR DRUM SWAGER June 26, 1945.

2 Sheets-Sheet 2 Filed Jan. 2, 1945 N DQ m m QM v H N xk n b m 3 vwm f mm N \J mw mm wN 6% Ow Patented June 26, 1945 UNITED STATES PATENT OFFICE DRUM SWAGER William F. Spahr, Southport, La. Application January 2, 1943, Serial No. 471,197

This invention relates to expanding machines for forming beads or annular enlargements on drums or barrel and like cylindrical objects, and an object of the same is to provide awmachine of this type which is of ruggedyet simple construction and capable of carrying out the expanding operation accurately and expeditiously with a minimum of manual labor.

Another and more specific object of the invention is to provide a drum or barrel expanding machine wherein the barrel body may be telescoped over a cylindrical expanding head and a bead automatically located and formed at the extremity of the drum, whereupon the drum may be partially removed from the head and a second or succeeding bead located and formed, thereby requiring only one set of expanders for any desired number of beads while at the same time effecting the beading operation with a minimum of manipulation or manual labor.

A further object is to generally improve expanding machines for cylindrical bodies.

The foregoing and other objects and advantages will become apparent in view of the following description taken in conjunction with the drawings, wherein:

Figure 1 is a view in broken sectional side elevation of a machine in accordance with the invention;

Fig. 2, a broken top plan view of Fig. 31;

Fig. 3, an end elevation of the machine with parts broken away and in section;

Fig. 4, a section taken substantially on the line 4-4, Fig. 1; h

Fig. 5, a detail view infa'ce elevation of one of the guide plates for'the expander shoe assembly.

Referring to the drawings in detail, the machine is provided with a base frame '10 having mounted thereon a housing Illa in which a drive motor I! is disposed, said motor being rigidly mounted on a pedesal bracket [2. 'The armature shaft Ila of the motor has mounted thereon a drive pinion 13 in mesh with a main drive gear l4 secured on a crank shaft 15, said shaft being rotatably mounted in bearings Hi and Ilia supported on pillar blocks or brackets I] and Ila. The outer end of the armature shaft Ila is preferably steadied and reinforced by a hearing unit l8 mounted on a bracket [9.

A crank 20 is secured on the outer end of the crank shaft 15 and is pivotally connected or journaled as at 2| to the lower end-of a link or crank arm 22, the upper end of said arm being pivotail'y connected to a crank .23 secured on the one end of a cam shaft 24.

The cam shaft 24 projects through a cylindrical head 25 having mounting plates 26 and 121 at opposite ends thereof in which bearing housings 28 and 2811 are mounted andcarry bearrugs 2'9 and 29a, for the camshaft 24. c

An expander assembly is removably mounted on the outer end of the head 25 and comprises a plurality of radially movable segmental shoes 36 of similar construction, each of which is formed with a recessed or undercut base por-. tion terminating in a :boss 30a having mounted.

therein a bearing 3| carrying a cam follower pin or roller 32. Each-of the shoes 30 is also formed with a peripheral die segment 33, which forms theibead on the drum-orother cylindrical objeet, and laterally projecting guide lugs =34 adapted to engage ina series of radial guideways 35 formed in the adjacent faces of a pair of oppositely disposed i'fro'ntand rear guide plates 36 and 36a, note Fig. 5..

The guide p ates36 and 36a are secured to the end plate 21 of the cylindrical head 5 by means of through bolts 31 which project through sleeves or bosses Ma disposed between recessed side portions of the segments 30, the said sleeves 3-la maintaining "the guide plates in definite spaced relation so as to permit a-free radial movement of the shoes 30.

To expand the shoes or die segments radially outwardly, a :circumferentially stepped cam 38 is secured on the outer end of the cam shaft 24 Y and is provided with a series of cam portions 3&0, adapted to engage the cam rollers 32 mounted on bearing must I. To retract the cam shoes or segments, the latter are formed with registering circumferential grooves 39 having mounted therein contracting springs 4-D.

The drive of motor ll causes rotation ofshaf-t 15 in one direction, and this rotary motion is changed to oscillatory motion when the drive is applied to cam shaft 24 through crank 21].

It will be'seen that when the cam shaft 24 is rotated in a counterclockwise direction as viewed in Fig. 3, the cam members 38a engage the cam rollers 3.2 and cause theshoes 39 to move radially outwardly between the guide plates 36 and 36a; and when the cam members 38a attain affully expanded position, the drive on the cam shaft is reversed and the springs 40 move the said shoes inwardly to their retracted position. Thus the working stroke of the expanding elements is of a positive nature while the retracting stroke is impositive. I

To spot or definitely locate the beads on the cylindrical barrel body, a rear stop gauge 4| is mounted on a calibrated slide 4Ia in turn adjustably mounted in the rear head plate 26 and secured in adjusted position by screw 4lb and to locate the opposite bead, or that on the other extremity of the barrel, or any number of intermediate beads, a front gauge 42 is mounted on the front guide plate 36 and projects outwardly therefrom, said gauge-being in the form of an elongated rod-like member having calibrations thereon for accurately determining the position of the beads.

The motor may be conveniently controlled from a push button station or bracket 43 having suitable conducting cables 44. connected thereto and leading to the switch mechanism of the motor. The working stroke of the crank 20 and expander cam 38 is such as to finish before the cam portions pass out of contact with the cam rollers, retraction of the shoes being attained by springs 43' when the cam shaft 24 is reversed. a

In operation, assuming the motor has been started, an attendant inserts a drum or barrel body over head 25, the gauge 4| havingbeen adjusted to definitely locate the bead at the one extremity of the barrel. The machine may be driven continuously, the attendant timing the operation so as to slide the cylindrical drum body onto the head 25 when the shoes ar retracted; and when the one end or edge of the barrel body contacts the gauge 4!, the shoes 30 move radially outwardly and the swaging operation ensues. When the shoes move into retracted position, the operator moves the barrel body outwardly until it reaches a predetermined point with respect to the gauge 42, whereupon the barrel body remains at rest until the swaging operation takes place on the opposite end of the barrel; after which the barrel is removed and another inserted to repeat the operation. Obviously any number of beads may be formed on the drum.

It will thus be seen that the swaging operation may be carriedon in an expeditious manner with only one set of expanding shoes and coacting parts. -This not only materially simplifies construction of the machine, resulting in lower initial cost as well as lower cost of upkeep and maintenance, but it also permits a free swaging operation without danger of mutilating a bead already formed. With a machine of this type, barrel bodies may be swaged in substantially the same time as where double or multiple swagers are used, without necessitating complicated parts necessary in multiple swagers.

The machine is of unusually rugged construction and will operate over long periods of time with a minimum of attention.

It will be understood that certain minor changes in construction and design may be adopted without departing from the spirit or scope of the invention as defined by the appended claims.

What is claimed is:

1. A drum swager comprising a base frame having a housing secured thereon, a drive motor disposed in said housing, a cylindrical head secured to one extremity of said frame and pro vided with front and rear end plates, a cam shaft and bearings therefor mounted in said end plates, a crank secured on the one end of said shaft,

means operatively connecting the motor with said;

crank for oscillating said shaft, an expanding assembly including an expander cam mounted on the opposite end of said cam shaft and formed with a plurality of circumferential cam portions and a plurality of expander shoes having laterally projecting guide bosses, guide plates connected in spaced relation and formed with radial guide grooves mounting said guide bosses, die segments formed on the peripheries of said shoes and conjointly adapted to form a head on the drum cylinder to be swaged, said shoes having cam rollers mounted in the base portions thereof adapted to engage said cam portions on said expander cam when the cam shaft is rotated in a direction to cause radial outward movement of the shoes, means connecting said guide plates to saidfront end plate, a rear gauge connected to said rear end plate for locating a bead at one extremity of the drum cylinder, and an elongated gauge connected to the front extremity of said head for locating a succeeding bead or beads after formation of said first bead, the drum cylinder to be swaged being removed axially out-. wardly from said head after each bead is formed. Y 2. A drum swager comprising a base frame, a drive motor mounted on said frame, a cylindrical head secured to one extremity of said frame over which a drum to be swaged is placed, a cam shaft projecting through and oscillatably mounted in said head, a crank secured on one end of said shaft, means operatively connecting the motor with said crank for oscillating said shaft, an expanding cam mounted on the opposite end of said cam shaft, a plurality of expander shoes having laterally projecting guide bosses and circumferential die segments, guide plates connected in spaced relation on opposite side of said shoes and formed with radial guide grooves mounting said bosses, means connecting said guide plates to the outer end of said head, cam rollers mounted in the base portions of the shoes and adapted to engage said expander cam when thecam shaft is rotated in a direction to cause radial outward movement of the shoes, a rear gauge having a stop member adjustably mounted adjacent the rear extremity of said head and adapted to be contacted by the edge of a drum, cylinder and determine the location of the firstbead to be formed on the drum, and

a rear gauge mounted adjacent the opposite extremity of said head for locating a succeeding bead or beads after formation of the first bead, the drum cylinder to be swaged being removed axially outwardly from said head after each bead is formed.

3. A drum swager comprising a substantially horizontally-disposed hollow cylinder constituting a head adapted to havea drum body tob'e swaged placed thereover, a cam shaft projecting through andoscillatably journaled in said head, a cranksecured to one extremity of said cam shaft and, a swaging" cam secured to the opposite end of said shaft, a pair of guide p a connected in spaced relation to one end of said drum on opposite sides of said cam, a plurality of radially movable swaging shoes mounted between said plates, said shoes and plates having interengaging guide means for guiding said shoes, the peripheral portions of said shoes being formed with die segments which act conjointly to form a bead on the drum, means for oscillating said cam shaft, rotation of the cam shaft in one direction causing said cam to move said shoes to expanding position, means resiliently urging said shoes to retracted position when rotation of the said cam shaft is reversed, 'a gauge for definitely mounting plate, a crank fixed to each said shaft 10 andsaid driving means, a crank arm connecting said cranks whereby rotation of said driving means will impart oscillatory motion to said cam shaft, a cam member fixed on said cam shaft exteriorly of said housing, and die segments grouped around said shaft and radially movable from said shaft by direct engagement of said cam member.

WILLIAM F. SPAHR. 

